A Ketron MS40 or X4 module (or if you don't mind extra keys, SD/SD1Plus) will do just that ... out of 4 separate outputs.

The good thing about these 2 is ... even the GROOVES (audio slices) can be sent out separately. If you can find one, grab it!
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[KETRON - USA]
Design Engineer & Product Specialist.
www.KetronAmerica.com